Cyanogen Bromide → N-[3-(2-Amino-3-propyl-3,4-dihydro-quinazoline-6-sulfinyl)-phenyl]-benzenesulfonamide

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Reaction Steps

A mixture of N-[3-(4-amino-3-propylaminomethyl-benzenesulfinyl)-phenyl]-benzenesulfonamide (0.00090 mol) and cyanogen bromide (0.00094 mol) in ethanol (30 mL) was stirred overnight at room temperature, and then the solvent was evaporated. The residue was triturated under diisopropyl ether, and the solids were filtered off. The residue was converted into the free base with a NaOH solution. The mixture was extracted with CH2Cl2, but the product stayed in the aqueous layer so the mixture was desalted with NaCl to yield an oil. The solvent was decanted, and the remaining oil was triturated under CH3CN. The resulting solids were filtered off, washed with diisopropyl ether, and dried to yield the title compound as a solid.

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